Question about Mitsubishi WS-55819 55" Rear Projection Television

2 Answers

Mitsubishi ws-55819 power loss problem

I went through the self diagnosis and got a 2 - 3 on the led front panel. I think this is a deflection protect (maybe a loss of vertical or horizontal deflection). I have heard through other people that there problem was the IC's behind the heatsink and another person had said it was there power switch that was bad. Just need assistance in finding exactly what it is so I don't get the wrong part. Do not have a schematic either. Thankyou, Wade

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  • 8 more comments 
  • midway Sep 12, 2007

    Have been closed out for some reason and have not even started the troubleshooting process with Shuttle 83. Must of got acceppted for some reason, was not me unless it was an accident. I was waiting for the schematics he told me to order. They will be in today, can you reconnect me with him. He is waiting my reply. Please take care of this problem, do not want to talk to a different person and pay again.

    Thank you,
    Wade

    -------------- Forwarded Message: --------------
    From: "FixYa.com"
    To: "midway"
    Subject: New Premium Solution
    Date: Tue, 11 Sep 2007 01:42:19 +0000

    Dear midway,

    Shuttle83 has offered a new solution for the WS-55819 55 in. Rear Projection Television - Mitsubishi ws-55819 power loss problem problem you posted on FixYa.com.

    Click Here to read this solution or find it in your Profile on Fixya.

    Please do not forget to tell us if this solution was helpful by accepting it. If you require further assistance you may reply to Shuttle83 or repost your problem to the other experts.

    Regards,

  • midway Sep 24, 2007

    I have the service manual with schematics and all, I have a meter and am ready for the troubleshooting. There has been some other information about the TV since we talked last. I had unplugged it from the outlet for about a day and a half, it worked good for a whole day after plugging it back in, but early the next morning noticed the green power light had turned itself on overnight. Could not turn it off with the remote or at the tv panel, had to unplug it. Sure seems like it is the power supply/power switch but I am ready to verify the problem with your help.
    Thank You,
    Wade

  • midway Sep 27, 2007

    Hello Techman,

    The green light in front never flashed at any time. Now, as of yesterday, the tv will not even power on at all at the panel or the remote. No green light either. I had the service manual sent to me on a cd. I will try to send the schematics to you without the diagnostics.

    Thank You,
    Wade

  • midway Sep 29, 2007

    Just sent the schematics for your reviewing. I will wait for your assistance.

    Thank You
    Wade

  • midway Sep 30, 2007

    Techman, checked pins 1, 2, 4 & 5 at IC9A20. I'm getting 60vac at each one.

  • midway Oct 02, 2007

    pin 1=163.3v 2=.013v 4=14.34v 5=1.83

    Sorry about the first readings

  • midway Oct 03, 2007

    Techman, I'm not sure if you recieved my last message with the readings. It's been two days? Anyway the voltage readings at IC9A20 checked good.
    Wade

  • midway Oct 04, 2007

    powered the tv on second later it powers back off, I then checked pin 1 and still was getting 164v. Went to check pin 2 and must of incidentaly touched something because had a spark. I guess I shorted out the power regulator because now I'm getting no voltage out of any of the pins. I'm assuming I have no choice but to change out the power regulator. Can you tell me the easiest way to do this. Do I slide the chassis out or take the pcb power card out only? Can you reccommend a parts place I can order from. I feel like I'm back at square one, because this probably was not the problem. I did locate L9A55 & 57 but could not of checked voltage because they where flush to the board? Would appreciate any advice to get me going in the right direction. Thank You, Wade

  • midway Oct 04, 2007

    Can you recommend a place where I should get the regulator? Is it easiest to remove the chassis?

  • Anonymous Mar 16, 2014

    Deflection protect (this could be loss of vertical or horizontal deflection)

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2 Answers

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  • Master
  • 3,130 Answers

Wade, is your manual an electronic PDF? If it is please send to techman32k@yahoo.com we will give it a look and see what we can find together. also without the diagnostics, is the little green light in front flashing?

Posted on Sep 26, 2007

  • 3 more comments 
  • Larry  Dillon
    Larry Dillon Sep 27, 2007

    If the set is completely dead, this should not be too bad of a repair UNLESS it received a power surge or a lightning strike. I will be waiting for the manual.

  • Larry  Dillon
    Larry Dillon Sep 30, 2007

    Wade, check IC9A20, the power regulator IC on pin 1 for 164 volts, then pin 2 for.2 volts, then pin 4 for 17 volts, and pin 5 for 2.5 volts

  • Larry  Dillon
    Larry Dillon Oct 01, 2007

    No DC voltage?

  • Larry  Dillon
    Larry Dillon Oct 03, 2007

    Are the voltage there all the time, or only when you first turn on the TV set? If they are there all the time, on that same board, on the other side of the big transformer, check the voltages on L9A55, and L9A57 and let me know what they are and if they are there all the time.

  • Larry  Dillon
    Larry Dillon Oct 04, 2007

    Well you have to replace the regulator iC first I'm afraid. We need to see if the power supply shuts down by reading the voltage before you turn it on and while and after you turn on the TV set.

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  • Master
  • 1,139 Answers

Hello Wade, We first need to find out what is wrong and to do that you need to contact the manufacture and get a schematic. Let me explain why. A television is a complex system, and there are components that channel hugh amounts of voltage and current, to go into the section that you need to go into without a schematic is ill-advised, I don't mean to sound preachy, but having 25 years of Electronics experience, two degrees in Electronics Engineering, being a Certified Electronics Technician, and a Certified Broadcast Technologist, even with all of this I don't do anything with electricity or electronics without having a schematic. The reason I said all of this was because of your last statement. I want to help you, but part of that help requires that you meet me or anyone here on FixYa half way, and if any of the technicians here require that you get a schematic, they are not telling you that because they want you to spend money, they are telling you that because they need to know what voltage levels are present and what ones are not. That could be the difference between you spending $400.00 (IHVT, HOT, Volt reg) and you spending .25 cent (Fuse). Now this is what I want you to do, I want you to call the manufacture and get a schematic, then I want you to get a Digital Multimeter. After you have these items, I will spend as much time as you need helping you with fixing this TV. I said all of this because I want to help you fix this problem but you have to at least beable to tell me what the circuit conditions are. I hope I have not offended you, Respectfully Submitted, Shuttle83

Posted on Sep 11, 2007

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Good Day,

This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times.
1 - 2 = no error detected
2 - 1 = X-ray protect (high voltage or beam current)
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2 - 4 = Vertical protect (usually loss of vertical from the source)
1. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. CHECK FOR LEAKY C9A60 470 PF 1000 V PART # 154P400030, PARALLEL TO D9A57 ON THE POWER PCB (NOT SHOWN IN THE SCHEMATIC).

2. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. CHECK FOR OPEN FUSES F9A04 AND F9A05 PART # 283P043090 ON THE +24 AND -24 VOLT LINES. IF THE FUSES ARE OPEN THE CONVERGENCE OUTPUT CIRCUIT WOULD BE SUSPECT.

3. SELF-DIAGNOSIS INDICATES SHORT PROTECT. CHECK FOR A SHORTED IC4B01 PART # 270P261020 (VERTICAL OUTPUT) LOADING 24-VOLT SUPPLY LINE. LOCATED ON THE MAIN PCB.

I hope this was helpful, BIG IRISH.

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Good Day, junop;
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